Apple has issued iOS 17.2.1, a surprise new iPhone update containing important bug fixes.
The security content of iOS 17.2.1—if any—remains a mystery, with no published CVE entries at the time of writing, according to Apple’s support page. Apple does write on the update itself that iOS 17.2.1 contains “important bug fixes” and is “recommended for all users.”
The sudden release of iOS 17.2.1 comes as a surprise. Apple released iOS 17.2 less than two weeks ago, containing a bunch of brilliant new features as well as some critical security updates.
At the same time, Apple has released iOS 16.7.4 for older iPhones. Note that as of iOS 17.2, Apple does not support newer devices with security-only updates any more. That means if you own a newer iPhone you must update to iOS 17.2.1 to ensure you are on the latest version and are as secure as possible.
Why iOS 17.2.1 Is Urgent
While currently, there is little about the content of iOS 17.2.1, it’s fair to speculate it is urgent. Apple needed to get iOS 17.2.1 out before Christmas and it seems the iPhone maker wanted to do this as early as possible before people are occupied with the holiday break.
There could be several reasons for this. If iOS 17.2.1 is purely a bug fix update, it needs to be ready in time for Christmas, when people are opening new devices. At the same time, if iOS 17.2.1 contains security fixes, Apple needs to make sure as many iPhone users as possible have applied the new update before attackers can get hold of the details.
Recently, iPhones have become the victim of multiple spyware attacks, so it’s important to apply any surprise updates as soon as you can. The fact Apple has also released iOS 16.7.4 indicates there could be a big security fix—as it would be unlikely iOS 16 and iOS 17 users would be suffering the same bugs.
For now, you know what to do—go to your iPhone’s Settings> General > Software Update and download and install iOS 17.2.1 now.
The Latest: Two Days After The Release Of iOS 17.2.1
Two days after the release of iOS 17.2.1, on December 21, iPhone users aren’t much wiser to what the new update contains. However, Apple expert and YouTuber Brandon Butch points to the Japanese release notes, which mention a fix for battery drain.
“This update addresses an issue where the battery may drain quickly under certain conditions,” he wrote on X, formerly Twitter.
It appears that this change is only confirmed in Japan, but it’s possible it somehow got missed out of the release notes elsewhere.
There is still no information about the security patches issued in iOS 17.2.1 and iOS 16.7.4. However, the latter could have fixed an iOS 16 bug that stopped people from reinstating built-in apps if they had been deleted, according to MacRumors.
Meanwhile, macOS Sonoma 14.2.1 fixes a security issue that could see a user unintentionally share incorrect content when sharing their screen.
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Update December 21, 10:15 EST. This article was first published on December 20 at 04:21 EST. Updated to include details about the Japanese release notes, which mention a fix for battery drain and MacOS security fix.
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